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In this paper, the nonlinear behavior in a tunable phase shifter using ferroelectric lead zirconate titanate (PZT) thin-film capacitors is described. The phase shifter is of reflection-type consisting of a coplanar waveguide Lange coupler and two ferroelectric PZT varactors on high resistivity silicon substrate. The nonlinearity is characterized by measuring the AM/AM and AM/PM transfer curves of...
A crucial issue in the exploitation of harmonic and multitone radar is the nature of target signatures at the various emission frequencies. In this paper we describe some preliminary results on how the nonlinear response of a target depends on its composition for the specific example of a target with a bare metal surface. Our results show that, in contrast to linear radar signatures, those with metal...
High-frequency small-signal circuit parameters are evaluated for a saturated-channel MESFET by including transit-time effects in a rigorous way through a study of induced shape changes in the saturated-channel region. Results agree well with empirical equivalent-circuit parameters for a physical MESFET.
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